In practice

Via our DynAccess service we enable you to
obtain a worldwide unique name for your computer.

This could be, for example, <YourCompany>.dynaccess.com.
Everyone who should be able to access your computer / company file server
can use this unique name to access at any time the resources you make
available.

This assumes:

The computer which is to be accessed currently has
an internet connection.

You have made the corresponding resources available
and correspondingly configured your firewall and router.